I fully agree that you should test fit the headers before trying to install them. If you don’t have the engine on a stand but you do have a spare head bolt it to a work bench. Make sure all the bolts can be installed easily with little or no wrenching. Also install the spark plugs and see if you can get a socket on them. Mine would not fit over all the plugs until I dented the tubes, a little, with a socket and big hammer. After you are sure they will fit consider having them coated (Jethot?) if they aren’t already. Otherwise you might be replacing them in a few years.
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